— What shall we do tonight then?

— ___  whatever you want. [ ]

A. Help yourself

B. It's a deal

C. No problem

D. It's up to you

在不同吸光度范围内读数会引起不同程度的误差，为提高测定的准确度，应选择最适宜的吸光度范围进行测定，计算表明最适宜的吸光度范围是（）之间。

A.0.2～0.8

B.1.0～1.8

C.0.2～0.4

D.0.4～0.8